Github user wuchong commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3829#discussion_r136362552
  
    --- Diff: 
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/BatchTableEnvironment.scala
 ---
    @@ -106,6 +106,43 @@ abstract class BatchTableEnvironment(
       }
     
       /**
    +    * Registers an external [[TableSink]] in this [[TableEnvironment]]'s 
catalog.
    +    * Registered sink tables can be referenced in SQL DML clause.
    +    *
    +    * Examples:
    +    *
    +    * - predefine a table sink with schema
    --- End diff --
    
    I think a pre-registered table sink should contain its own schema 
information, so I prefer `registerTableSink(String, TableSink)` interface. If 
we register a table sink without schema in it, we can throw an exception.


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